private static bool RemoveSpecial(IList <ListenerPrefix> coll, ListenerPrefix prefix)
{
if (coll == null)
{
return(false);
}
var c = coll.Count;
for (var i = 0; i < c; i++)
{
if (coll[i].Path != prefix.Path)
{
continue;
}
coll.RemoveAt(i);
return(true);
}
return(false);
}
private static HttpListener MatchFromList(string path, List <ListenerPrefix> list, out ListenerPrefix prefix)
{
prefix = null;
if (list == null)
{
return(null);
}
HttpListener bestMatch = null;
var bestLength = -1;
foreach (var p in list)
{
if (p.Path.Length < bestLength || !path.StartsWith(p.Path))
{
continue;
}
bestLength = p.Path.Length;
bestMatch = p.Listener;
prefix = p;
}
return(bestMatch);
}
private HttpListener SearchListener(Uri uri, out ListenerPrefix prefix)
{
prefix = null;
if (uri == null)
{
return(null);
}
var host = uri.Host;
var port = uri.Port;
var path = WebUtility.UrlDecode(uri.AbsolutePath);
var pathSlash = path[path.Length - 1] == '/' ? path : path + "/";
HttpListener bestMatch = null;
var bestLength = -1;
if (!string.IsNullOrEmpty(host))
{
var result = _prefixes;
foreach (var p in result.Keys)
{
if (p.Path.Length < bestLength)
{
continue;
}
if (p.Host != host || p.Port != port)
{
continue;
}
if (!path.StartsWith(p.Path) && !pathSlash.StartsWith(p.Path))
{
continue;
}
bestLength = p.Path.Length;
bestMatch = result[p];
prefix = p;
}
if (bestLength != -1)
{
return(bestMatch);
}
}
var list = _unhandled;
bestMatch = MatchFromList(path, list, out prefix);
if (path != pathSlash && bestMatch == null)
{
bestMatch = MatchFromList(pathSlash, list, out prefix);
}
if (bestMatch != null)
{
return(bestMatch);
}
list = _all;
bestMatch = MatchFromList(path, list, out prefix);
if (path != pathSlash && bestMatch == null)
{
bestMatch = MatchFromList(pathSlash, list, out prefix);
}
return(bestMatch);
}
public void RemovePrefix(ListenerPrefix prefix)
{
List <ListenerPrefix>?current;
List <ListenerPrefix> future;
if (prefix.Host == "*")
{
do
{
current = _unhandled;
future = current?.ToList() ?? new List <ListenerPrefix>();
if (!RemoveSpecial(future, prefix))
{
break; // Prefix not found
}
}while (Interlocked.CompareExchange(ref _unhandled, future, current) != current);
CheckIfRemove();
return;
}
if (prefix.Host == "+")
{
do
{
current = _all;
future = current?.ToList() ?? new List <ListenerPrefix>();
if (!RemoveSpecial(future, prefix))
{
break; // Prefix not found
}
}while (Interlocked.CompareExchange(ref _all, future, current) != current);
CheckIfRemove();
return;
}
Dictionary <ListenerPrefix, HttpListener> prefs, p2;
do
{
prefs = _prefixes;
ListenerPrefix lpKey = null;
foreach (var p in _prefixes.Keys)
{
if (p.Path == prefix.Path)
{
lpKey = p;
break;
}
}
if (lpKey is null)
{
break;
}
p2 = prefs.ToDictionary(x => x.Key, x => x.Value);
p2.Remove(lpKey);
}while (Interlocked.CompareExchange(ref _prefixes, p2, prefs) != prefs);
CheckIfRemove();
}
